Square side door - flap door

Square side opening door is a one-way valve installed at the outlet of the drainage pipe by the river. When the tide level of the river is higher than the outlet pipe and the pressure is greater than the pressure inside the pipe, the door panel will automatically close to prevent the river tide from flowing back into the drainage pipe.

Paimen is a one-way valve installed at the outlet of the drainage pipe along the river. When the tide level of the river is higher than the outlet pipe and the pressure is greater than the pressure inside the pipe, the Paimen panel automatically closes to prevent the river tide from flowing back into the drainage pipe. According to the customer